In the Italian series "L'ispettore Coliandro" an entire episode was about satanic sects/black masses and heavy/black metal subculture.
The series is normally quite funny and is produced by the national tv company.
Steve Sylvester of the band Death SS is one of the mian characters of this episode, and there are some real bands (like In Tormentata Quiete and Death SS) as well as fictional bands playing.
The episode was called "666" (total KTHRSS worship ) and can be found on youtube